268results about How to "Fully exposed" patented technology

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention relates to a preparation method of a three-dimensional ferrocobalt metal oxide oxygen evolution catalyst. According to the method, foamed nickel is selected as a carrier, the foamed nickel is pretreated, a metal ion and ethanol mixed solution is evenly adsorbed to the surface of the foamed nickel, then open fire ignition is carried out, and a second-level self-limiting combustion process is carried out, so that metal ions form a ferrocobalt metal oxide material with a three-dimensional network structure in situ on the surface of the foamed nickel. The method is simple and easy to implement, a target product can be generated within second-level time, and the area of a foamed nickel matrix is adjusted according to needs, so that the three-dimensional ferrocobalt metal oxide catalyst is prepared on a large scale. The material obtained by the invention is used as an oxygen evolution anode catalyst, and the three-dimensional network-shaped ferrocobalt metal oxide oxygen evolution catalyst shows excellent electrochemical performance.

The invention discloses a flexible self-supporting porous pole piece for an ion battery, a membrane module and a preparation method, the porous pole piece is a porous positive pole piece or a porous negative pole piece, the overall thickness is 9-150 microns, the porous pole piece comprises a supporting framework, an active material and a conductive agent, the supporting framework is a porous fiber membrane made of ultra-high molecular weight polyethylene, and the active material is a porous fiber membrane made of ultra-high molecular weight polyethylene. Active materials and conductive agents are distributed on the surface of the supporting framework. The membrane assembly comprises a porous pole piece and a diaphragm layer which are connected and form an integrated structure, and the number of the diaphragm layer is one, and the number of the porous pole piece is one or two. The preparation method comprises the following steps: preparing a porous pole piece in an extrusion-stretching manner, or preparing a membrane assembly in a co-extrusion-stretching manner, and performing high-temperature annealing after extraction to obtain the high-performance porous pole piece or membrane assembly. The porous pole piece and the membrane assembly have good flexibility, the performance of the porous pole piece and the membrane assembly is not changed after the porous pole piece and the membrane assembly are folded for multiple times, meanwhile, the expansion problem of the porous pole piece and the membrane assembly in the charge-discharge process is effectively avoided, and the thermal stability is high.

The invention discloses a FeAl diatomic catalyst with axial chlorine modification as well as a preparation method and application thereof, and relates to an atomic-scale dispersion catalyst as well as a preparation method and application thereof. The FeAl diatomic catalyst with axial chlorine modification provided by the invention takes nitrogen-doped carbon as a main body, and FeAlClN6 active sites are distributed in the main body; the structure of the FeAlClN6 is as follows: Fe and Al are coordinated with four N atoms, wherein two N atoms are bridge type N atoms coordinated with Fe and Al at the same time; eight atoms of FeAlN6 are in the same plane, and Al is coordinated with Cl in the vertical direction. The preparation method comprises the following steps: dispersing the carbon matrix, the iron source, the aluminum source and the nitrogen source in a solvent, stirring, drying by distillation, and carrying out heat treatment on a solid in an inert atmosphere to obtain the catalyst. The highest power density of a fuel cell assembled by the catalyst reaches 1339mW / cm < 2 >, the half-wave potential retention rate is 98% after 30,000 cycles of cyclic aging, and the catalyst can be applied to the electro-catalysis fields such as pollutant degradation, chemical nitrogen fixation and carbon sequestration, catalytic energy conversion and the like.

The invention relates to the technical field of phototherapy instruments, in particular to a light control system and method for a phototherapy module, and the system comprises a plurality of assembly carriers, a plurality of line concentration assemblies, a plurality of phototherapy assemblies, a control assembly, a gravity sensing assembly, and a temperature sensing assembly. The line concentration assemblies are sequentially connected in series, the phototherapy assemblies are connected with the line concentration assemblies, the line concentration assemblies are transversely arranged on the assembly carrier, the assembly carrier is provided with an assembly groove, the phototherapy assemblies are arranged on the assembly groove, and the control assembly comprises a phototherapy control module, a gravity receiving module, a temperature sensing receiving module and a power supply module. The phototherapy control module is connected with the phototherapy assembly through the line concentration assembly so as to control the phototherapy assembly. The number of components can be flexibly increased or decreased, and the layout can be adjusted to adapt to wider treatment scenes and individual requirements.

The invention belongs to the technical field of chemical energy materials, and particularly relates to a rare earth element doped Ru-based catalyst and a preparation method and application thereof. The molecular formula of the catalyst is RuxREy-NMC, and Ru metal ions and rare earth metal ions are loaded on a nitrogen-doped mesoporous polymer; wherein x is equal to 0.5 to 3, and y is equal to 0.01 to 0.1. The preparation method comprises the following steps: firstly obtaining a nitrogen-doped mesoporous polymer through a hydrothermal reaction, then introducing Ru and RE through a wet chemical impregnation method, and finally sintering at a high temperature in a protective atmosphere, and Ru nanoparticles coexist with Ru monatomic atoms and RE monatomic atoms. According to the catalyst, the adsorption behavior of a reaction intermediate is regulated and controlled by introducing rare earth elements, hydrogen evolution reaction kinetics is accelerated, meanwhile, the catalyst has a hierarchical porous structure and a large specific surface area, and full utilization of active sites is facilitated. The catalyst shows catalytic performance superior to that of commercial Pt / C under alkaline ampere-level current density, and the preparation method is simple and low in cost.

The invention provides a fresh air module and a duct type air conditioner. The fresh air module comprises a shell which is provided with a first access hole; the access cover plate is detachably arranged at the first access hole in a covering manner; a mounting opening is formed in one axial end of the volute, and the mounting opening faces the first access hole; the flow guide ring is arranged at the mounting opening in a sleeving manner, and an air inlet communicated with the mounting opening is formed in a surrounding manner; the flow guide ring is detachably connected with the volute and can enter and exit from the shell through the first access hole; the filter screen assembly comprises a fixing frame and a filter screen installed on the fixing frame, and the fixing frame is fixed to the flow guide ring. Therefore, the shell of the fresh air module only needs to be provided with one access hole, the maintenance of the wind wheel and the motor and the replacement of the filter screen can be realized, and the maintenance problem of the fresh air module caused by the limitation of a suspended ceiling structure is solved.

The invention discloses a movable guide mechanism of a dyeing soaking pool, which comprises the dyeing soaking pool and further comprises a guide assembly, movable guide rollers are arranged on the left side and the right side in the dyeing soaking pool, the guide assembly comprises a fixed frame, and the fixed frame is fixedly connected to the middle of the top in the dyeing soaking pool. Auxiliary guide rollers are arranged on the left and right sides in the fixing frame, a fixing transverse plate is fixedly connected to the middle of the top in the fixing frame, and fixing guide boxes are fixedly connected to the front and rear sides of the bottom of the fixing transverse plate. According to the device, the top of the fabric is expanded by arranging the movable guide rollers, so that gaps among fibers of the fabric can be enlarged, dye is easier to be in full contact with the fabric during soaking, the efficiency is higher when the fabric is soaked and dyed, the fabric can be more fully exposed in the dye by expanding the fabric, and the fabric can be better dyed. The dye can more uniformly permeate into each part of the fabric, so that the phenomenon of non-uniform dyeing is reduced, and a more consistent and attractive dyeing effect can be obtained.

The invention discloses an impurity removal device for rice production. The impurity removal device comprises a machine box, a feeding hopper, a screening mechanism, a transmission mechanism, a turning shovel mechanism and an adsorption mechanism, and the machine box is vertically arranged; the feed hopper is arranged at the top of the case, and the lower part of the feed hopper is communicated with the interior of the case; the screening mechanism is arranged in the case, and the two sides of the screening mechanism are movably connected with the two sides of the case; the turning shovel mechanism is arranged in the machine box, located above the screening mechanism and connected with the screening mechanism through the transmission mechanism. The discharging mechanism is arranged in the machine box and located below the screening mechanism, and the bottom of the discharging mechanism penetrates through the side wall of the machine box. The invention further discloses a using method of the device. The rice impurity removing device can remove impurities from rice and is good in impurity removing effect and high in working efficiency.

The invention relates to a copper-based catalyst for hydrogen production through methanol cracking and a preparation method of the copper-based catalyst, and belongs to the technical field of hydrogen production through methanol cracking, and the preparation method of the copper-based catalyst for hydrogen production through methanol cracking comprises the four steps of nano zirconium phosphate modification, preparation of nano zirconium phosphate-copper manganese zinc oxide, preparation of copper aluminum zirconium gel and aftertreatment. The copper oxide content of the obtained copper-based catalyst for hydrogen production through methanol cracking is 7.5-14.3 wt%, the initial performance is that the methanol conversion rate is 97.1-98.2%, the hydrogen selectivity is 98.2-98.9%, the CO content in reformed tail gas is 0.11-0.17%, and the heat-resistant performance is that the methanol conversion rate is 96.5-97.7%, the hydrogen selectivity is 97.6-98.3%, and the CO content in the reformed tail gas is 0.15-0.19%.

The utility model discloses a novel water magnetizing device for cleansing lotion inner material production. The novel water magnetizing device comprises a shell, a water inlet connected to the top end of the shell and a water outlet connected to the bottom end of the shell. An iron core is detachably arranged in the shell, a spiral water pipe is wound on the outer wall of the iron core, and the top end of the spiral water pipe is fixedly connected with the water inlet. According to the novel water magnetizing device for cleansing lotion inner material production, the wire is powered on, the iron core assists current to be better spread in the wire so as to enhance a magnetic field, and the spiral water pipe is designed to be spiral so that water can be more fully exposed in the magnetic field when flowing in the spiral water pipe through the water inlet; by means of the design, the contact area and time of water and a magnetic field are increased, so that the magnetization effect is improved, a stable magnetic field is generated in the shell in cooperation with the magnet ring, the magnetic field is overlapped with a magnetic field generated by the wire, the magnetic field intensity is further enhanced, and the magnetization effect of water in the spiral water pipe is improved.

The invention discloses a method for measuring the content of sodium alginate and the M / G ratio, belongs to the technical field of quantitative analysis of sodium alginate, and solves the technical problems of complex detection method operation, long reaction time, high cost and large detection result error of the method for measuring the content of sodium alginate in the prior art. The method for determining the sodium alginate content and the M / G ratio provided by the invention comprises the following steps: acidolysis of sodium alginate, titration of a sodium alginate acidolysis solution by using a potentiometric titrator to obtain a titration curve, differentiation of the titration curve to obtain a first-order derivative curve, and calculation of the volume of a corresponding titrant to obtain the sodium alginate content. According to the detection method, a plurality of results can be obtained through one-time titration, the efficiency is high, the method is simple, and rapid detection of the sodium alginate content and the M / G ratio is realized.

The invention discloses a seedling raising device for mine ecological restoration, and relates to the technical field of seedling raising for mine ecological restoration, the seedling raising device for mine ecological restoration comprises a seedling raising box, a temperature controller, an illuminating lamp and a humidifier are fixedly installed in the seedling raising box, and a placing mechanism is arranged in an inner cavity of the seedling raising box. By arranging the moving unit, during seedling culture, a user places a seedling culture vessel in an inner cavity of a placement hole, plant seedlings are cultured through a temperature controller, an illuminating lamp and a humidifier in the seedling culture box, when seedling hardening is needed, a cabinet door of the seedling culture box is opened, then a bottom plate is moved out of the inner cavity of the seedling culture box, and the seedling culture vessel is moved out of the inner cavity of the seedling culture box. After the seedling raising plates are moved out, adjusting rods are rotated, so that the three seedling raising assemblies are in a horizontal state, and a second supporting plate is moved, so that the seedling raising vessels are fully exposed in air, seedling hardening is facilitated, and the seedling raising plates do not need to be manually carried.

The utility model provides harmless treatment equipment for medical wastes, which relates to the technical field of treatment equipment, solves the problem of poorer high-temperature sterilization and disinfection effects of the existing treatment equipment, and comprises a feeding box, a crusher is mounted at the bottom of the feeding box, and a treatment box is mounted at the bottom of the crusher. A first fixing part and a second fixing part are mounted on the surface of the treatment box, a group of first mounting plates are mounted on the surface of the first fixing part, an electric cylinder is mounted on the surface of the second fixing part, a mounting part is mounted at the output end of the electric cylinder, and a group of second mounting plates are mounted on the surface of the mounting part; a connecting plate is mounted at the bottom of the second mounting plate, and a box door is mounted on the surface of the connecting plate. The device can crush waste, so that the waste can be fully exposed, the high-temperature sterilization and disinfection effect is improved, meanwhile, the treated waste can be quickly taken out, and the practicability is improved.

The invention discloses a preparation method and application of a copper-doped carbon nitride loaded PtCu alloy catalyst, and belongs to the field of electrocatalysis, the preparation method comprises the following steps: dissolving melamine and copper nitrate in ethanol, and drying to obtain a product; the product is subjected to pyrolysis in the N2 atmosphere, and Cu-doped carbon nitride (Cu / g-C3N4) is prepared; then uniformly grinding Cu / g-C3N4 and citric acid, and performing pyrolysis in an N2 atmosphere to prepare Cu / NC; pt4 + is added into Cu / NC, excessive sodium borohydride solution is dropwise added, and the PtCu / NC electrocatalyst is prepared. The nanosheet PtCu / NC electrocatalyst is prepared through pyrolysis and simple reduction, the preparation process of the catalyst is simple, the cost is low, and an electrochemical test shows that the obtained catalyst is good in oxygen reduction performance.

The invention discloses a method for rapidly degrading BPA based on activation of PMS by iron-nitrogen co-doped pomelo peel biochar, and belongs to the field of treatment of emerging organic pollutants in environmental water. The method comprises the following steps: mixing iron-nitrogen co-doped shaddock peel biochar with a BPA solution, performing ultrasonic stirring, adding a PMS stock solution, and performing stirring to degrade BPA; wherein the use amount of the iron and nitrogen co-doped shaddock peel biochar is 0.05 g / L to 0.2 g / L. According to the method, the shaddock peel is used as the biochar, and the prepared iron-nitrogen co-doped shaddock peel biochar catalyst and a PMS catalytic system have efficient, stable and complete degradation capacity on emerging organic pollutants and can be recycled.

The invention relates to the technical field of disinfection cabinets, and particularly discloses a disinfection cabinet device with a plasma disinfection function, the disinfection cabinet device comprises a disinfection cabinet body, a feeding frame and a discharging frame, and the feeding frame and the discharging frame are fixedly arranged on the two sides of the disinfection cabinet body respectively. According to the disinfection cabinet device, the conveying assembly is arranged in the disinfection cabinet body, and the conveying assembly is used for carrying out automatic feeding and discharging operation on articles entering the disinfection cabinet body, so that the disinfection efficiency of the disinfection cabinet device on the articles is improved, manual feeding and discharging of the disinfected articles in the disinfection cabinet body are not needed, on one hand, the labor intensity of workers is reduced, and the disinfection efficiency is improved; according to the disinfection cabinet device, on the one hand, when some heavy articles are disinfected, on the other hand, continuous disinfection treatment on the disinfected articles is achieved, the disinfection treatment efficiency of the disinfection cabinet device is remarkably improved, and the articles in the disinfection frame are comprehensively disinfected through active substances such as atomic oxygen and free radicals generated by the plasma generator.

The invention discloses preparation and application of a carbon-based fine desulfurizer for one-step conversion of recyclable carbonyl sulfide into elemental sulfur, and belongs to the field of environmental protection. The preparation method comprises the following steps: (1) dissolving a carbon-nitrogen precursor and a transition metal precursor in a solvent, and carrying out stirring reaction at room temperature; (2) centrifuging the turbid liquid obtained in the step (1), and drying to obtain a solid a; (3) roasting the solid a obtained in the step (2) in an inert atmosphere to obtain a solid b; and (4) carrying out acid pickling and drying on the solid b obtained in the step (3), and then reducing in a reducing atmosphere to obtain the target product carbon-based fine desulfurizer. After the prepared catalyst is treated in a reducing atmosphere, the coordination microenvironment of metal is improved, stable metal-nitrogen active sites are formed, and the metal is effectively prevented from reacting with sulfur element to generate metal sulfate and metal sulfide. The catalyst can be regenerated and used after being purged by high-temperature Ar gas, the catalytic performance of the catalyst is not affected, and the catalyst is superior to a commercial Al2O3 catalyst.

The invention relates to the technical field of pdc drill bit treatment, in particular to a pdc drill bit surface nitriding treatment process. The pdc drill bit surface nitriding treatment process comprises the following steps that pretreatment is conducted, a pdc drill bit is selected, cleaning treatment is conducted on oil stains and rust on the surface of the pdc drill bit, grinding and polishing treatment is conducted after cleaning, and pretreatment of the pdc drill bit is completed. According to the treatment method for the pdc drill bit, the surface of the pdc drill bit subjected to sand blasting treatment can be effectively combined with a nitriding layer, so that a thick and tightly combined nitriding layer can be formed on the surface of the pdc drill bit, and the treatment effect on the pdc drill bit is effectively improved; according to the pdc drill bit disclosed by the invention, the carbon water coated on the surface of the sand and the heat generated when the sand impacts on the surface of the pdc drill bit are utilized, and the generation of the heat enables the carbon water to uniformly cover the surface of the pdc drill bit to form a gelatinization layer with rich pore structures, so that the combination effect of the surface of the pdc drill bit and the nitridation layer is further improved, and the use performance of the pdc drill bit is further improved.

This invention discloses a magnetic solid-phase extraction method for detecting trace amounts of glucocorticoids in hydrophilic media, belonging to the field of sample pretreatment and chromatographic analysis technology. The method includes: adjusting the pH of a hydrophilic medium sample containing glucocorticoids and adding an ionic strength modifier to obtain a pretreated sample; mixing a magnetic covalent organic framework-based composite nanomaterial with the pretreated sample and performing oscillatory extraction under a dynamic gradient magnetic field to adsorb the glucocorticoids onto the material surface; separating the material adsorbed with glucocorticoids using an external magnetic field and discarding the supernatant; performing ultrasonic-assisted elution of the material using an elution solvent and collecting the eluent; and detecting the eluent using high-performance liquid chromatography-diode array detector (HPLC-DID) and calculating the glucocorticoid concentration based on a standard curve.

The invention relates to the technical field of biology, in particular to a polypeptide combination and application thereof. The invention provides a human giant cell IgM epitope polypeptide. The invention also provides a method for coupling the epitope polypeptide with horse radish peroxidase. The invention also provides a detection method of the epitope polypeptide coupled horseradish peroxidase applied to the human giant cell IgM detection kit. The method has the advantages that the two epitope polypeptides are identified for the first time to detect positive serum samples of human cytomegalovirus IgM, the human cytomegalovirus IgM detection kit adopting the polypeptides as specific antigens has excellent sensitivity and specificity, and the standard is easy to control.

A device for breaking and fluffing monofilament twisted yarn at intervals comprises: a wire dividing assembly, on which a plurality of sieve holes are arranged, through which fiber monofilaments used to form monofilament twisted yarns are respectively arranged in wire division; a wire breaking assembly, inside which a first through cavity with an axially symmetrical structure for passing monofilament twisted yarns is arranged, and at least one cutter for cutting off fiber monofilaments is arranged at intervals on the inner wall of the first through cavity; wherein the wire breaking assembly is arranged at the downstream end of the wire dividing assembly, and the symmetry axis of the first through cavity is arranged coaxially with the center of the wire dividing assembly; the fiber monofilaments are arranged to enter the first through cavity after being arranged in wire divisions in the sieve holes, and are twisted during the movement to generate spiral motion to form monofilament twisted yarns, and the spirally moving monofilament twisted yarns contact the cutter, and part of the fiber monofilaments on the surface of the monofilament twisted yarns are cut off by the cutter at intervals to form fiber fluff.

This invention relates to the field of resistance furnace technology, specifically a box-type resistance furnace for diesel fuel ash content testing. It includes a furnace body and a furnace door mounted on the furnace body. A covered ash dish is placed inside the furnace body. The device also includes a two-stage locking mechanism on both the furnace body and the furnace door. This mechanism locks the furnace door with a slight gap before fully closing it. By using the two-stage locking mechanism, the furnace door is first locked in a gap-free state to allow gas to escape and prevent pressure buildup, and then locked in a fully closed state to ensure airtightness and improve testing accuracy. Furthermore, under the action of a linkage mechanism, closing the furnace door causes the deflector tray and covered ash dish to rotate into the furnace, reducing manual interference. When the furnace door is fully closed, the covered ash dish is automatically opened, fully exposing the sample and ensuring reliable and standardized testing. The entire process involves few steps and is simple and convenient.

A high-load cobalt-based single-atom catalyst for oxygen reduction and its preparation method are disclosed, belonging to the field of electrocatalysis technology. This method utilizes the cage structure in ZnCo-ZIF to encapsulate nitrogen-rich metal molecules, followed by high-temperature carbonization under nitrogen conditions to obtain the catalyst. Benefiting from the separating effect of Zn metal nodes in ZIF and the spatial confinement effect of the ZIF cages, as well as the high nitrogen content in the guest molecule, a cobalt-based single-atom catalyst with a loading of 4.0 wt% was prepared. Furthermore, compared to traditional preparation methods, the catalyst prepared using a mixed solvent exhibits a small particle size, resulting in a high specific surface area that fully exposes the active sites. The large specific surface area allows for the full exposure of the high-load metal atom active sites, thus demonstrating excellent performance in the oxygen reduction reaction, with a half-wave potential of 0.88 V and a limiting current density of 6.0 mA·cm⁻¹ in 0.1 M KOH electrolyte. ‑2 .

The invention discloses a method for preparing a graphene-supported Ni-MOF hydrogen storage catalyst, wherein nickel nitrate hexahydrate and graphene oxide are weighed and dissolved in dimethylformamide, stirred at room temperature to make a uniform mixing reaction, terephthalic acid is added, stirred sufficiently to dissolve, and then placed in a reactor for heating reaction, solid-liquid separation is performed after the reaction is completed, and a solid product is collected, washed, and dried to obtain a graphene-supported Ni-MOF hydrogen storage catalyst, which is named G@Ni-MOF. The graphene-supported Ni-MOF hydrogen storage catalyst proposed in the invention has a simple preparation process and mild reaction conditions, and is expected to be applied to other hydrogen storage systems. The introduction of graphene can effectively improve the catalytic activity of the Ni-MOF catalyst, and the prepared composite catalyst has good thermal stability and can improve the hydrogen storage kinetics of the MgH2 hydrogen storage material.

The utility model provides a capsicum seed coater with nutrition coating, including shell and install the air intake system at the shell bottom end, the shell is equipped with the diversion pipe and distribution plate in proper order from top to bottom, the distribution plate is provided with a plurality of air holes, is provided with the feeding gap between diversion pipe and the distribution plate, and the feeding gap is provided with the nutrition coating. A material falling area is formed between the flow guide pipe and the shell; a material spraying assembly is mounted on the distribution plate, and the material spraying assembly and the flow guide pipe are coaxially arranged; the shell is provided with a spraying ring assembly, and the spraying ring assembly is arranged above the flow guide pipe; the utility model can solve the problems that when the stirring mechanism in the prior art is used for stirring materials with irregular shapes and lighter particle weights, some areas on the surfaces of the materials can still be in a shielded state for a long time and are difficult to fully expose and effectively contact atomized coating liquid drops.

The utility model discloses a tea processing device, which belongs to the technical field of tea processing and comprises a frame, a tea tray and a rotating column. A plurality of leaking holes located in the outer side of the rotating column are formed in the tea bearing tray; the peripheral side of the rotating column is rotationally connected with a turning rod in the radial direction; each turning rod is sleeved with a turning ring; a plurality of bent turning plates are uniformly arranged on the peripheral side of each turning ring; a drying assembly located above the tea bearing tray is arranged on the frame body, and the drying assembly is used for drying tea leaves in the tea bearing groove; in the application, through cooperation of a plurality of turning plates, in the drying process of the drying assembly, tea leaves in the tea bearing groove can be turned continuously, position exchange of the tea leaves on the upper layer and the lower layer is ensured, local excessive or insufficient drying of the tea leaves is effectively avoided, and the drying uniformity of the tea leaves can be ensured; and meanwhile, the tea leaves can be prevented from being adhered together through the rotation of the turning plate, the tea leaves are prevented from being blocky, the tea leaves can be uniformly spread, the tea leaves are better dried, and the drying effect is improved.

The invention relates to the technical field of chemical monitoring, in particular to an N-methylaniline impurity online spectrum monitoring device which comprises a bottom rack, a plurality of glass boxes are evenly arranged on the bottom rack in the length direction, the glass boxes sequentially have different deflection angles, and the deflection angle difference values of the adjacent glass boxes are equal; by arranging the multi-angle deflection glass box, static and multi-angle static monitoring of N-methylaniline is realized, spectral characteristics of impurities in different directions can be effectively captured, and slow rotation of the glass box further drives the internal N-methylaniline to change angles, so that a light source can fully irradiate, and the detection accuracy is improved. Impurities possibly hidden due to local gathering are repeatedly exposed in dynamic rotation, a monitoring blind area is eliminated, the comprehensiveness of impurity detection is remarkably enhanced through the steps, and the accuracy of a monitoring result can be greatly improved especially for trace impurities which are not evenly distributed.

The invention discloses a method for efficiently leaching platinum group metal in a waste automobile catalyst, and belongs to the field of rare and precious metal smelting. The method comprises the following steps: a leaching process: mixing the hulled waste automobile catalyst with a leaching agent, carrying out acid leaching in an acidic solution for a period of time, adding a complexing agent to complex platinum group metals, leaching for a period of time, and filtering to obtain a pregnant solution rich in the platinum group metals and carrier residues; wherein the leaching agent is a cerium-containing compound; a resin adsorption process: adsorbing the pregnant solution through an adsorption column filled with adsorption resin to obtain an adsorbed solution; and an elution process: washing the adsorbed adsorption resin with water and eluting the platinum group metal step by step, and regenerating the eluted adsorption resin for cyclic utilization. The method aims at avoiding generation of toxic and harmful substances (chlorine and NOx) and use of highly toxic cyanide in an existing wet process, environmental pollution and potential safety hazards are fundamentally eliminated, and meanwhile the leaching efficiency of the platinum group metal is remarkably improved.

The utility model discloses a trachea cannula fixing device, which relates to the technical field of trachea cannula fixing devices and comprises two fixing strips which are symmetrically arranged and two binding belts which are symmetrically tied on the two fixing strips, and two connecting pieces are symmetrically hinged between the two fixing strips. A clamping assembly used for clamping a trachea cannula is detachably connected between the two connecting pieces through a clamping assembly. During use, through the arrangement of the two connecting pieces hinged between the two fixing strips, when a medical worker cleans and nurses the mouth of a patient, the two fixing strips can be sequentially rotated to be away from the mouth of the patient, so that the mouth of the patient is more thoroughly exposed, cleaning dead angles are reduced, and the cleaning and nursing effect on the mouth of the patient is improved.